Concealed unit for heating and ventilating



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Nov. 25, 1930. M. J. cALLAHAN CONCEALED UNIT FOR HEATING AND VENTILATING Filed Feb. 20, 1925 Ik- {111:1} LII- i1-.- 1li -L Nov 25, 1930. M. J'. CALLAHAN l 1,782,711

CONCEALED UNIT FOR HEATING AND VENTILATING Filed Feb.` 20, 1925 4 Sheets-Sheet 2 IZ /////v A TTURIVEK.

NOV. 25, 1930. M J, CALLAHAN I 1,782,711

CONCALED UNIT FOR HEATING lAND VENTILATING Filed Feb. 20, 1925 4 Sheets-sheet s A omver,

Nov. 25, `1930. M. J. CALLAHAN CONCEALED UNIT FOR HEATING AND VENTILATING -4. sheets-sheet 4 File@ Feb; 2o, 1925" Patented Nov. 25., 1930 y UNITED A STATES PATENT "oFFlcE t interieur.v .'r. CALLHAN, or NEW Yoan, N. Y;

CONCEA'LED UN IT FOR HEATING AND 'VENTILATINQG I Application led February 1.20, 1.925. Serial No.v 10,715.

tion and secure alleged'sightliness, suchI as schools, lecture halls, ball rooms, and other public assembly rooms in hotels yorv other buildings,

Among the objects of my invention may be noted the following: to provide a heating and Ventilating machine, apparatus orunit which is adapted to be'located or'installedv in a small space or room such .as a wardrobe,

. coat-room or closet usually spaced or partitioned of from school-rooms or lecture rooms in large buildings, so as to control the temperature of an adjacent room without being exposed to the latter or to being tampered with, investigated or experimented with, and

so that it will not directly radiate or throw vo heat from its parts into the room to be heated and ventilated; to provide a unit, such as referred to, comprising certain essential elements'which are adaptedto supply fresh said fresh` airto the 'desired temperature, and deliver the y'heated air' into a separate room or space where the a paratus is not located, but adjacent to whic it 'is installed,

' in order to obtain allv the benefits derived from a unit located in the room the-tempera-ture of which is to be controlled; to provide a heating and Ventilating unit adapted to convert fresh coldair'into ail-'heated t the desired temperature, and deliver the -same tothe -room `orspace where desired di" g vrectly from-the unit', while the latter is con cealed, and also to vcontrol the operation .of

the unit either manually or electrically, or throughthe medium of the temperature o the room to which ythe air is delivered; to .provide a strong, durable, compact 4and electi've unit apparatus adapted to vroducethe functions and results noted in t e foregoing, and which isfor may be entirely or air from the outside o f the building, heatl trolle partially concealed from sight of personsgin the room, the temperature of which iscontrolled, and which apparatus or unit, in its operation, is controlled by the temperature in 4the 'room to which the air is delivered; to so construct and install a heating and ventilating unit that it may perform all its functions and carry out its modes of operation in 'a small, finite space adjacent the room, the temperature `of which is to beregulated andthe ventilation of which is to be cotr0lled,the unit being compact, economical of production and in operation and capable of carrying out its operations and producing its functions either Iautomatically or partly under manual controlito provide a combination`of appaf ratus and mechanical -means Lsuch that theforegoing objects can be obtained with econ# ony both in materials, structure and space, and sothat space otherwise serving no useful purpose can be utilized to great advantage; to

rovide structures and combinations of means c y 'which the various parts of the 'apparatus may be inspected, repaired when necessary, readjusted, readily installed, and efective y Y controlled in its functional arts, to provide certain novel devicesin a eating and ventilating unit, of the concealed or semi-concealed type, including (l) a unit asa whole 1 'having no part in the room, the temperature of which is to be regulated and controlled, l but having its discharge passage terminate in the latter room, (2) a duplexmixing dam r inthe unit which is-automatically contro ed, or operated through the medium of a motor orA mechanical means which are either eleo-V tricall thermostatically or manually vconfrom within'the room the tempera- Y4 ture of which is to be re ulated and .controlled, (3) an intake for yresh air, located in the spaceof unit installation, the admission of air throu h which may be controlled by a damper which is operated through'the medium ofa motor controlled by a switch or other medium in the room the 4temperature of which is to b e regulated and controlled, (4) means by which the various parts of the apparatus may be inspected from within the room, the temperature of which is to bh regulated and controlled, (5) and means by which recirculation can be brought about from the room through the apparatus and into the room by the adjustment and manipulation of simple parts; and to provide certain details of construction which are-strong, durable, effective and which are compactly and economically disposed in the apparatus and in the room or space of installation of the apparatus, adapted to carry out the modes of operation and produce the functional results hereinbefore and hereinafter noted. Y

With the above objects in view and others which will be detailedduring the course of this description, my invention consists in the parts, features, elements and combinations thereof hereinafter described and claimed.

In order that'my invention may be clearly understood, I have provided drawings wherein:

Figure 1 is a view showing in front elevation a unit heating and Ventilating apparatus embodying my invention, the same being concealed in a closet, wardrobe or cloak-room, parts of the figure beingbroken away to show details of construction, and the duplex mixing damper being shown in position to direct the fresh air so that it will traverse the heating, chamber and be discharged into the room at predetermined temperature;

Figure 2 is a longitudinal sectional View taken on the line 22 of Figure 1;

Figure 3 is a horizontal sectional view taken on the line 3 3 of Figure 2; and

Figure 4 is a view similar to Figure 2 showing an alternative form of Ventilating unit embodying my invention.

Referring to the drawings, the numeral 1 indicates the wall of a room or, it may be,

the outer wall of a building, and the numeral 2 indicates a wall of the building, or, it may be, the wall of a room, said walls 1 and 2 aiding in the production of a space which may be part of a cloak-room, wardrobe or other space particularly set aside for the installation of apparatus for heating and Ventilating purposes. The room orcspace may also be partitioned to provide a ventilating shaft 3 in some portion of which, usually the bottom thereof, a grille 4 is set, through which cold and foul air may pass and be conveyed to the outside of the building, `either directly or indirectly, as may be desired. In the form of my 'invention shown in Figures 1 to 3, the casing of the unit is specially constructed to provide the necessary chambers in ,which are placed the various elements and apparatus constituting the unit structure. In this instance of my invention, the casing is divided into a heating chamber 5 containing a heating element 6 such as a radiator, which may'beof any approved type, or such as the one which I have installed in most of my heating and Ventilating units, and whichI is disclosed in my Design Patent #54,059, granted Nov. 4,

1919, and which I have found to be unusually satisfactory because of itslample radiating surface. The radiator is supported on brackets 7 which are secured to the opposite ends of the casing in any approved manner, the same being made of angles set at a proper distance from the base of the unit so as t0 provide a humidifying chamber 8, in which is usually set a water pan (not shown) for cleansing and humidifying the air passing into the heating chamber. The heating chamber is formed by the back 9 of the casing, the ends 10, and a bafHe-plate 11, the latter extending approximately the length of the tradiator and being spaced from the front 12 of the casing to provide an inlet or fresh air passage and 'chamber 13, through which the fresh air passes to the humidifying chamber, and thence to the heating chamber. The front 12 of the casing, at its top, is extended outwardly at 14 to provide an-enlarged entrance to the inlet chamber 13, and also to provide a deflector or shunt adapted to properly direct the air entering from the blower chambers 15, as hereinafter explained. The upper end of the portion 14 of the front' wall of the casing is properly joined with angle 16, on which, together with others making a rectangular fra-me, the motor board 17 is set and may slide, said board supporting the motor 18, which drives a plurality of fans 19 operating in casings 20 providing the chambers 15, the lower open ends of which casings communicate with a passage 21 in the motor board communicating with the inlet passage and chamber 13. The fan casings are open at their opposite sides so as to enable the fans to suck air at their axes or eyes from the room, chamber or space 22 in which the unit is installed. The rear wall 9 of the casing is extended at its top and bent forwardly to provide the rear wall of a discharge passage 23, the front wall 24 of which is similarly extended and curved and forms the back ,of the fan and motor space or chamber in the room of installation. Preferably, the discharge passage 23 is fiared at its delivery end, and the latter has a grille 25 set therein at the end of the casing which projects through the opening 26 in the wall 27 of the room, the `temperature of which is to be regulated and which is to be ventilated. The wall 27 is provided with a large opening which is closed by a panel 28 of any suitable material which, at its lower end, rests upon the floor of the room to be heated and ventilated, the said panel being properly held in place by a ledge 29 suitably placed and applied and to which the panel can be secured in any suitable manner. At its upper end, thev panel 28 is provided with a lmovable door 30 which may be hinged to the panel 28 or which may be so secured thereto as to be readily removed therefrom when it is desired to inspect or repair the motor and fans or anymechanism which can be approached y through such opening. A suitable molding and support 31v is applied to the lower edge ofthe wall 27 against which the door 30 can bei s'et and secured. Thus by arranging the motor board 17 to slide upon the angles or supports 16,'the vapparatus carried thereby can be readily inspected, removed and replaced, The panel 28 may also be removed' forV the purpose of inspecting the lower portion'of the unit and the parts carried thereby,

and also for the purpose of installing the apparatus or gaining admissionto the room of installatiom as may be required. Air driven by the fans `will be caused to travel downwardly in the -passage 13 to the humidiying,

shown in Figure 2 and hold it there.

phon ltype mounted in any suit-able andfcf-` ective osition with reference to the damper. Prefera ly, the motor casing36` is secured Figure 2, and its plunger 37 has ivoted to it a lever 38 which is also pivote -to a lug or 4bracket 39 von the frame of the motor. The 'lower end of the lever is connected by an expansion .spring 40 to the casingwall 12, and the upper en'd of the lever is pivotally connected to a link 41, the innerend of which is pivoted at 42 to a lug-on the member 32 of the mixing damper. Thus, normally, under the control of the spring 40, the lever 38 tends to draw the damperv into the full line positliln .to the front of the casing12, as shown in Opposite ends at 47 to the top and bottom walls of the passage 44, the members of the damper being suliciently extensive to entirely close the passage when required. Preferably, the inlet damper 46 is operated by a sylphon or motor generally indicated at 48, in all material respects substantially the same as that which operates the mixing damper; and said motor may be operated in the same way, or in any one ot the ways indicated for the operation of the. mixing damper. The plunger of the motor 48 operates the damper 46, through the medium of a link 49 pivoted at one end to the plunger, and at its opposite end to one lot' the Wings of the damper. Thus the inlet ot fresh air to the chamber 22 can b e controlled as well as the temperature of the air passed through the unit from the chamber 22 of installation ot the unit to the room the temperature of which is to be regulated.

It is to be noted that fresh air enters the room or chamber 22. ot installation of the unit, directly and the blower chamber 15 indirectly; that is to say, the blowers draw fresh air from the room 22, not directly from the exterior of the building. The fresh air is driven by the fans directly down into the enlarged upper portion ot passage 13. If the mixing damper is in the solid line position of Figure 2, the air will pass through passage or chamber 13, into the humidifying chamber 8 where it will be cleansed and moistened. From chamber 8 the air will pass through heating chamber 5, in which its temperature will be raised to maximum, and the heated air will be discharged through passage or chamber 23 into the room of service. Temperatures below maximum can be given the fresh air by shifting the mixing damper, as

has been described; and all cold air, or at outside temperature, can be discharged into the room of service by shifting the mixing d amper to the dotted line position of Figure 2, viz., across the heating element at its top and across the passage 13, thus entirely bypassing the heating chamber. When the cold air by-passes the heating chamber, it is not humidified, since the air, as taken from the outside, is suiiiciently laden with moisture. The water pan can be placed and removed by lifting the door 28a in panel 28, as shown in dotted lines, Figure 2, and by lifting the door 12a in the front wall 12 of the casing, handles being provided in both instances for the purpose.

As before stated,- when it is desired to pass cold air from the outside directly to the room of service, withoutany preliminary heating,

the mixing damper is'shifted from fthe solid line to the dotted line position of Figure 2. This makes a chamber for completely bypassing the heating chambervand heating element therein, and, by flaring the upper wall 14 of the passage .13, the by-pass chamber is enlarged and made to extend from front to back of the casing; and the flared wall 14 also provides for shunting the air, driven down by the fans, backwardly to the discharge passage 23, giving the air a swirling action with initial direction up the passage 23. Thus the space above the heater and below the level of the motor board becomes both a by-pass chamber and a mixing chamber; for, under predetermined control, the mixing damper is shifted into any one of the dotted line positions of Figure 2, so that hot and cold air will be mixed in said chamber. If the control is by thermostat, the temperature of the room of service will primarily control the tempera ture of the air delivered by the unit, the intermediate means, operated by the thermostat, for shifting the damper being either electrical or pneumatic. If the control of the temperature of the room is to be by manual means, a hand-operated switch will be shifted to enable the motor 36 to operate to shift the mixing damper into desired position.

When it is desired to recirculate the air in the room of service, for a quick rise of temperature, or because the outside temperature is too low, the upper door 30 can be opened allowing air to pass from the room of service to the room 22 of installation. The duplex damper 46 will be closed andwith the fans in operation, the air will be taken from room 22 and driven throughl the unit in any one of the three ways indicated, viz., (1) for all hot air, passage 13, heating chamber 5, and passage 23; (2) for mixed hot and cold air, passage 13, heating chamber 5, by-pass chamber, and passage 23; and (3) for all cold air, by-pass chamber and passage23. I Or, the door 30 can remain closed and the lower door 28a can be opened, enabling the cold air in the room of service to enter the room of installation so that the fans can draw the said cold air and drive it through the unit in anyof the three ways noted in the foregoing. v

In the form of my invention shown in Figure 4, `the unit is only partially concealed; that is to say, it is entirely concealed from the room of service the temperature of which is to be regulated, and the unit stands out in the room of installation which may be a cloakroom, wardrobe, closet or servicey room of, some kind. In other words, the unit is not boxed oil or placed in a finite section of a cloak-room, etc., as in the form of my invention shown in Figures 1 to 3. In this form, the unit vis installed at the wall or partition l50 and discharges through a grille 51 suitably disposed therein. The wall 1s also provided with an opening in which is set a hinged panel yor door 52 adaptedto be opened for inspection of certain portions of the apparatus, and alsoadapted to provide'for recirculation of the air in the room of servicethrough the apparatus. The back. of the casing or frame of the unit indicated at 53 is, at its top,

lll@

` to provide'a flange 61 operating yas a stop curved to pass about the heating chamberv 54,

. a by-pass; that is to sag, e

and heating element 55which is at the upper part of the casing and unit.n The bathe-plate jv at the front by the casing plate 59 and at the bottom by the partition or casingplate 60, the latter, at its inner edge, being upturned for the mixin damper^62 pivotally mounted at its upper e ge, as at 63,'0n the lower edge of the baiiie 56. An angle 64 applied to the back 53 of the casing also dperates as a stop for the mixing damper 62 at the opposite exi treme of its movement. The motor and blower chamber 65 is below the heating. and by-pass chambers and contains the fans 66 and motor (not shown) similar to the one h shown in the other form of my invention, Figof the unit casing into either the heat-ing ure 3. In this instance, the fans discharge upwardly through their casing 67 at the rear chamber, 'or the by-pass'ch'amber, or both the by-pass'chamber and heating chamber 57, ac-

cording'to the position of the mixing damper 62.` AThe motor Vand fans are mounted on anv gles or supports 68 between which the unit v vide an inlet chamber 69 into which the inlet Aand for the same purpose, and ma g erated in'the'- same way, as descrlbe 1n concasing at its bottom is extended, so as to propassage 70 is entered," the vsame being protected by ixed louvers 71, the same as in the other form of my invention. A duplex inlet damper 72 is also applied in the same nanner e opnection with theother form of my inveniton; but, it will be noted that, in this form of my invention, the cold air enters below the fans n into the chamber 69 which is a part oaf the unit and at the top oi which the fans operate, the latter thus drawing the air in at their axes or eyes and discharging upwardly into the heating .and by-pass' chambers. The back wall of theI casing at the chamber 69 is provided with a swinging door 73 enabling the damper 72 and louvers 71 to be inspected. There lis also a swinging door 74 at the back "of the ,motor and blower chamber 65, rendering it convenient to inspect and repair the motor or fans, as the case may be. The motor vandfans are carried by a suitable support, the

,l legs of which are indicated atv 67, the remainder of the support not being shown since 4 it is vno part 'of my invention. It is important only that the motor and fans shall be supported conveniently forinspection, repair anduremoval through either of the doors 52 or "i The mixing damper 62 is fixed to its piv- 7 otal bar 63, which latter isprovided atl a suitable point with a worm-wheel or gear 75 adapted to be operated by a worm 76 carried by a rod 77 extending through the unit casing or alongside the same, and through the wall 50,'at Which point it is enlarged, as

'at 78, to provide ahead or'operating disk \ro0m the temperature of which is to be controlled. and atthe same time is 'freely accessible from the room of installation. Also,

this form of my invention `provides recirculating possibilities from both the room of installation and the room from the temperature of which is to be regulated, through door 52, the damper 72 being closed, or through either or both ofthe doors 73, 74. i

Within the scope of my invention, the mixing damper may be thermostaticall or electrically controlled through the me ium of a sylphon orother form of motor, in both forms of my invention shown in the drawings, or said damper may be hand-controlled through the medium of lsuch motor, or said damper may be hand-controlled by `direct means such as shown in Figure 4.` vAll the controlling means for the mixing damper have not been forms, since so to do would unduly multiply the figures of the drawings or confuse the gures employed to demonstrate my invention. Moreover, in each instance the inlet damper maybe either motor-controlled or hand-controlled as noted with reference to the mixing dam er. v I

4In the form o my-invention just described and shown in Figure 4, the mixing damper, differs from the mixing damper of Figure 2 and its mode of operation is diierent; that is to-say, the mixing damper 62 is hinged along its t`op edgeand depends into a small chamber below'the heating element 55 and 1abotiegthey partition 60,l` and the damper' 62 is a single one-blade damper, as distinguished rom'the double or two-blade damper shown in Figure 2. Inthe Figure 4 construction,

the cold air is drawn into the inlet chamber through the damper 72 by the fans 66 and is ber between the vpartition 60 and'the heating driven by the latter yinto the smaller.cham

' eating directly with said opening, a heating' Figure 4 and indicated by the solid lines, the damper 62 shuts off the by-pass chamber and shunts all the cold air driven by the blowers into the damper chamber into contact with the radiator, from whence it is driven through the heating chamber into the mixing chamber and out through the grille 51. This is an extreme position of the damper 62 and the opposite extreme position of the damper is against the upstanding lug or ange 61, in which position the damper shuts off the heating chamber and allows all the cold air to pass through the by-pass and discharge chambers into the mixing chamber and out through the grille 51. In any intermediate position of the damper 62, more or less of the cold air driven by the blowers, according to the position of said damper 62, will be driven through the chamber'57 and the heating chamber in contact with' the radiator and into the mixing chamber, the tempered air then assing through the grille 51 into the room o service. As shown in Figure 4, the adjustment of the damper is through the medium of the rod 77 and worm or gearing devices 75, 76, which are coupled with the shaft 63 on which the damper 62 swings, or the damper may be operated thermostatically or electrically or pneumatically or through the medium of a sylphon, as suggested in connection with the structure of Figure 2 and as shown therein at 36.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

1. A heating and Ventilating unit consisting of a casing divided into a heating cham? ber located wholly at its back, a humidifying chamber located below the heating chamber and extending forwardly thereof, a fresh air inlet passage beside and parallel with the heating chamber, a by-pass chamber at the top of and formed as a part of the inlet passage, and a discharge passage formed in continuity with the heating chamber; a mixing damper located between the heating chamber and blower chamber and adapted tov entirely close the heating chamber at its top, .and to shut off the inlet passage thus defining the bottom of the by-pass chamber; and means for operating the mixing damper to enable it to perform its functions substantially as described.

2.r In combination with a room having an inlet for fresh air and an opening in its wall, a heating and vVentilating unit located in the room and comprising a mechanism inclosing casing having a discharge passage communielement in a chamber formed in continuity with said passage; a single mixingdamper pivotally mounted in the casing adjacent said element; and means by which air may be drawn through the inlet and driven through the casing so as `to be discharged throughlsaid passage and the opening in the wall of the room. 4

3. In combination with a room to be served with air of regulated temperature, a room of .finite space in which a heating and Ventilating unit may be installed; a wall between the two rooms having a discharge opening and a movable panel; a heating and ventilatin unit located adjacent and behind the panel 1n the room of iinitespace so as to be easily inspected, said unit comprising an inclosing casing having means lfor drawing I and driving air, a heating element, a single mixing damper cooperative with the heating element, a discharge passage fromythe heating element in direct communication with the discharge opening in the wall, and means for operating the mixing damper"` 'so as to control the flow of air through the discharge passage.

4. A heating and Ventilating unit comprising a casing divided into a plurality of chambers, one adapted to contain the heating element, another adapted for the passage of fresh air, and another adapted toenable fresh air to by-pass the heater and located above the heating chamber, the unit also having a 'discharge passage; the fresh air chamber being parallel with the heating chamber and opening into the by-pass chamber at the top and into the heating chamber at the bottom; and means for drawing air and driving it into and through the several chambers; a mixing damper mountedv between the heating and by-pass chambers and adapted to be shifted to simultaneously close the heating chamber and the fresh air chamber, or to be shifted into any one of a plurality of intermediate positions; and means for shifting the damper relatively to v the heating and by-pass chambers, substantially as described.

5. In combination with a service room the temperature of which is to be controlled, a room of finite space having a fresh air inlet thereinto, and a discharge opening through thewall thereof to the room of service, a movable panel in the said wall between the two rooms, said panel having a door at its bottom and a door at its top; and a heating and Ventilating unit in the room of finite space arranged adjacent said panel so as to be reached therethrough, said unit having a motor and blower adjacent the top door of the panel and a humidifying chamber adjacent the bottom door, and an air discharge passage extending therefrom to the discharge opening in the wall.

6. In combination with a room of service, a room of installation, a discharge opening in the wall between the two rooms having a movable panel, a fresh air inlet into the room 'means `to operate the same exposed in the room of installation; and a discharge passage in the unit and connecting directly with the opening in the wall. 7. In combination with la room of service,

a room of installation, a wall between the two rooms having an opening and a movable panel, a coldair inlet to the room of installation; a heating and Ventilating unit located in the room of installation adjacent the panel and having a discharge passage connecting directly with the opening in the wall; a damper located at the cold air inlet, and means for shifting the damper to control the passage of air through the unit.

8. A heating and vent1lat1ng unit having, l in combination, a casing having a chamber at its bottom containing a heating element,

and a discharge chamber at the top, and a motor and blower between said element and discharge chamber, a singlepivotally mounted mixing damper positioned to swing so as to control the exit f the heating chamber and the entrance of the discharge chamber, and means for actuating the damper to shift the same between extremes to any one of' a plurality of positions, whereby air of predetermined temperature may be delivered from the unit.

9. A heating and Ventilating unit comprising a casingdivi-dedinto a plurality of chambers, one at the bottom of the casing adapted to contain -humidif ing means, a chamber above the humidifylng chamber adapted to contain a heating element, another chamber above the humidifying chamber and parallel with the'heating chamber for the passage 'of e fresh air to the heating chamber, a by-pass chamber above the, heating chamber, a -dischargechamber above the by-pass chamber;

means for drawing and driving air mounted on the outside of the casing; a'support for` said means having a passage therethrough into the fresh air and by-pass chamber; and

a mixing damper located between the by-pass chamber and the heating chamber; and

`means for actuating the mixingdamper.

10. A heating andventilating unit comprising acasing divided into a plurality of chambers, one adapted to contain a heating element, another adapted for-the passage of fresh air, and another adapted to enable fresh air to by-pass` the heater and located above the heating chamber, the unit also having' a discharge passage; and means for drawing. air and driving `it into and through the.`

several chambers; a duplex 'mixing damper mountedtbetween the :heating and by-,pass

chambers and adapted to be shifted to si-mul-v taneously close the heating chamber and the fresh-.air'chambe'r, orto beishifted into any one of a lplurality of intermediate positions; and means for shifting the damper relatively' to 'the' heating andby-pass chambers, substantially described.. 1

v'11. A heating and Ventilating unit comprising a casing having a humidifyn chamber at the bottomand a discharge c amber or passage at its top, and a heating chamber between the two said chambers,- a fresh air inlet chamber, and a by-pass chamber, the

fresh air inlet'chamber being enlarged at its topvto aid in the production of the by-passv ing'for drawing and driving air comprising a support with a passage therethrough into the by-pass chamber; and means foractuating the mixing damper whereby its positionmay be changed as desired or'accordin to the temperature of the room to'be serve by the unit. f.

12. A heating a casing divided .into a heating chamber, a

fresh air chamber, a discharge chamber, anda by-pass chamber, thefresh air -chamber at. its top above the heatiln larged; a motor boa having a passage therethrough located at the top ofthe fresh air chamber; a motor vand blower means mounted on the board; a mixin discharge chamber, heating chamber and fresh air chamber; and means for ,actuatin the damper enabling it to assume any one o a plurality of positions between extremes for completely cuttin olf they heating chamber and a portion of t e fresh air chamber from the by-pass and discharge chambers, or for` p artly closing thev heating chamber, the fresh air chamber and the by-pass chamber, substantially as described.

13. A. heatingand'ventilatin -unit comprising a casing .having cham ersl in the 'lower portion cf which humidifying means and a heating element may be located, and in which a oale is arrangedto divide the space of the casinlg into a heating .chamber and.- a fresh air chamber; and al mixing and Ventilating unit having' chamber being enf damper mounted to cooperate with the heatin chamber, discharge chamber, fresh air c amberand-by-,passchambe'r and between extremes of movement to b e shifted relatively td the damper arranged in the lower part of the e casing above the heating and vfresh air' chambers and adapted to cut olf said 'chambers to nprovide a bypass chamber'; and the upper part lof the casing being formed into a dis- :charge chambercommunicating with the -b'ypass chamber--a support 4mounted fat the junction between the upper Aand lower portions of the' flzasing Vand having a passage therethrough to the by-pass chamber, and having mounted thereon a motor and blower, the casing lof which latter communicates with the passage through the support; and means for actuating the damper enabling it to be shifted between.extremes into any one of a plurality of positions, substantially as described.

14. A heating and Ventilating unit comprising a casing divided into a plurality of chambers, one at the bottom of the casing for the admission of fresh air, one at the top of the casing for the discharge of air from the unit, an intermediate support -for a motor` and blower, and another chamber adapted `to contain a heating element; in combination with a mixing damper pivotally mount-- ed to swing within the casing between the blower and heating elementand to control the delivery of air through the discharge chamber.

15. A heating and Ventilating unit com-l heating chamber, the entrance to the inlet and the entrance to the discharge passage; and means for actuating the damper to shift the same between extremes to any one of a plurality of positions, whereby airv of' predetermined temperature may be delivered from the unit.

' 16. A heating and Ventilating unit comprising a casing, the lower portion of which is divided into chambers adapted to contain respectively humidifying means and heat- ,ing means, and also containing a chamber into which and through which fresh air may pass tothe other two chambers, the casing also having at its top a discharge chamber withV an opening at the front of the unit, and the casing also having approximately at its middle a by-pass chamber, anda mix- -ing damper mounted therein; means for actuating the mixing ,damper to control the passage of air to the heating chamber and from the latter to the discharge chamber; and a motor and blower mounted at the middle of and on the outside of theY casing and dapted to drive air into the'by-pass cham- 17. A heating and Ventilating unit comprising an inclosing casing divided by a part tition to forma fresh air passage on-one side and a heating chamber on the other side, a damper pivoted between its ends at the top of the partition, and means for operating the damper to simultaneously partially or entirely close the chamber and passage and form a by-pass above them.

18. A heating and Ventilating unit comprising an inclosing casing embodying a fresh air passage, a heating chamber and a discharge passage above said chamber; a damper pivotally mounted between the fresh air passage and the chamber and adapted to swing across the discharge passage; and

, means for operating the damper to partially or entirely close the fresh air passage and form a by-pass above it to control the temperature of air passing through the discharge passage.

19. A heating and Ventilating unit comprising a casing divided into a plurality of chambers, one at the bottom of the casing for.

the admission of fresh air, one at the top of the casing for the discharge of air from the unit, an intermediate support for a motor and blower, and another chamber adapted to containa heating element; in combination withl a single `mixing damper pivotally mounted along its upper edge so as to swing within the casing between the blower and heating element and to control the delivery of air through the discharge chamber.

20. A heating and Ventilating unit comprising a casing divided into a plurality of chambers, one at the bottom of the casing having an opening for the admission of fresh air and having a motor and blower located therein, one at the top of the casing for the discharge of air from the unit and an intermediate chamber having a heating element therein; in combination with a damper'pivotally mounted to swing within the casing between the blower and heating element and adapted to control the delivery of air through fighe heating chamber and the discharge cham- 21.,A heating and Ventilating unit comprising a casing divided into a plurality of chambers, one at the bottom of the casing having an opening for the admission of fresh air and having a motor and blower located therein, one atthe top of the casing for the mixing and discharge of air from the unit, and a vertical partition dividing the intermediate space of the unit into two chambers,

jorte having a heating element therein and the other forming a by-pass chamber; in combination with a mixing damper pivotally mounted on the partition to swing between the heating and by-pass chambers and being thereby adapted to control the passage of air Vfrom the blower to the discharge passage and direct said air'more or less through the heating and by-pass chambers.

22. A. heating and Ventilating unit comprising a casing having its interior space divided into a blower chamber, a heatin chamber above the blower chamber, a y-pass ing for actuating the damper, to set the same ,l

chamber above the blower chamber and beside the heating chamber, a mixing chamber above `the heating chamber, and a discharge opening at the top of the casing; in combination with a mixing damper pivotally mounted at the bottom of the heating chamber so as to swing between theI latterand the blower chamber, and means for shifting the damper relatively to the blower discharge so as to control the path of the air from the blower through the unit.

23. In a device of the class described, the combination of a radiator casing provided with air intake ports and with a discharge port at its upper end and otherwise closed, air heating means and air circulating means housed within the casing in superposed order, said casing provided with a conduit for conducting the discharge from the circulating means past one side olf the heating means to give the air an initial preheating before it is discharged into contact with the heating means and said conduit being of inverted l..

shape with a part thereof leading horizontally from said preliminary heating part to discharge the air into direct heat absorbing contact with the heating means.

24. Means for regulating and controlling the air circulation within an enclosed casing, comprising a shaft mounted within the .casing, a damper secured to the shaft along its top edge, means accessibly carried by the ycasin predetermined position relative to the air passage within the casing, said means includi'ng a rotary rod, a grooved member connected to said rod, and a connection between said member and the damper.

25. Means for regulating and controlling i the air circulation within an enclosed casing,

comprising a shaft mounted within the casing, a damper secured to the shaft, means accessibly mounted'on the casing for. actuating ,the shaft, said means-including worm gear devices connected to the damper.

26. A heating and Ventilating unit comprising a casing having at its bottom a blower chamber and a fresh air inlet; a heating chamber and -a by-pass chamber, both above said blower chamber; a discharge chamber. at the top of the casing; a single shiftable damper located between the heating and by- 'by-pass chamber; and means for shifting the mixing damper so as to control the passage of air from the blower chamber to the heating and by-pass chambers.

28. A heating and Ventilating unit comprising a casing having a blower chamber at its' bottom; a heating chamber above the blower chamber; a by-pass chamber beside the heating chamber; a mixing damper located at the entrance to the by-pass chamber and between the heating and blower chambers; and means for actuating the mixing damper whereby to control the passage of the air from the blower chamber through the heating and by-pass chambers.

29. A heating and Ventilating unit comprising an inclosing casing having a heating chamber; means in the casing for driving air through said chamber; and means whereby both the entrance and the discharge ends ofthe heating chamber may be completely shut olf.

30. A heating and Ventilating unit comprising an inclosing casing having an inlet chamber at its bottom, a discharge chamber at its top, heating and by-pass chambers between the top and bottom chambers; a blower disposed in a chamber below the' heating and by-pass chambers; a damper located at the entrance to the heating and bypass chambers for controlling thel passage of air therethrough; and means for actuating the damper to change its osition whereby the amount of air passing tliirough said heating and by-pass chambers can be controlled.

MICHAEL J. GALLAHAN.

lpass chambers to control the passage of air j from the blower chamber to the discharge chamber; and means for shifting the damper so as to direct' the air through eitherthe heating `or by-pass chamber, or partly through both of said-chambers'.

27. A heating andl Ventilating unit comprising a casing having a blower chamber at its bottom, a discharge chamber `at its top, and a heating and -a by-pass chamber between the top and bottom chamber; a mixing damper interposedbetween the blower and heating chambers and at the entrance to the 

